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I am sorry, but I don't agree on that: one page includes a long list of media files that the other one doesn't include. I see these two pages quite different as main content. Of course top navigation, side and bottom are identical (typical in an ecommerce sites), but the main content is quite different, in my opinion.

Look at the problem this way: what do you think should I do to differentiate those pages furthermore? Adding more and different text? I see the first page listing the media files already including a good number of text completely different by the second page. If SEOmoz duplicate page algorithm is giving feedback from a UI stand point (seen that it ignores completely my canonical tag definition on those two pages), as a "human" myself I see those pages with a completely different content and purpose. Therefore, I assume the algorithm is faulty in some way. Do you really see those pages with nearly identical content as a human yourself??!

The duplicate content interface can occasionally be confusing in our campaign manager. I think you're reading this wrong, as I look at your account (to be fair to the other people trying to help, they don't have the ability to do that and are doing their best to assist). You have some duplicates due to a navigational issue, I think. For example:

These appear to be nearly identical, except for breadcrumb links. I think that's what we're picking up on. They each canonical to their core HTML page (without parameters), but those two pages are different, so the duplicates appear to be true duplicates.

I won't give any numbers, but your duplicate content error count relative to your total indexed page could is incredibly low, so I think this may just be a fluke of a product that got double-listed or a category that has two paths.

So, I agree that the SEOmoz duplicate report should be improved graphically to avoid such a kind of confusion.

And that kind of duplicate issue is actually something that I might need to fix on my part... but with the fact that both duplicate pages belong to two different items and have two different canonical definitions may possibly solve the problem by itself... or not? I guess this is one of those rare cases where SEs can actually get confused!

What would you suggest to do with this kind of cross-similar product pages? Those are legitimate pages belonging to two different items that have the same kind of content (i.e. same included music pieces) but written for different instruments! And here is, in fact, another thread where I am discussing about how to handle these kind of similar products found often in the music industry, where the same piece of music can be written for several different instruments causing nearly-duplicate pages:

We get this confusion often enough that we'll be changing it up a bit in the near future.

If this was a common problem, I'd probably recommend a different structure, with a parent page that splits into arrangements (cello/piano, flute/piano, etc.) and then rel=canonical to the parent product. Practically, though, this looks like a very isolated case on your site affecting maybe a dozen pages out of thousands. I probably wouldn't lose sleep over it, as I doubt it's having much impact either way. I think it's just something to be aware of for down the road, as the site grows.

In my opinion, these are not two different pages. They are the same page with a different parameter.

I am not an expert on how search engines handle these types of URLs but if this was my site I would be using a technology that allows different tabs to display without adding a parameter to the URL.....

I think there is some confusion here. I think we must approach this issue by looking from 2 perspectives only: from the SE stand point and the user (UI) stand point.

From the SE stand point, I have setup a canonical tag definition which should take care of the duplicate issue (if I am not correct here, what are canonical tags for?).

From the user stand point, I repeat what I stated above: I don't see those two pages so similar as the bot has reported since the main content is completely different indeed (different textual content, different media, different purpose), therefore the duplicate issue from a UI prospective, is my opinion irrelevant.

To reinforce my thesis above, the fact you are suggesting me to approach such a "possible" duplicate issue via AJAX, tells me that my biggest concern should be from a SE stand point (which, I repeat, should have been tackled with the canonical tag) and not from a UI stand point (otherwise, why use AJAX instead than URL parameters if the UI end result is the same??!).

I will wait for your further thoughts. I am sorry, but I am not convinced by what you are telling me and I still don't understand what value I must then give to the duplicate report from SEOmoz bot considering that: 1. SEOmoz bot ignores the canonical tag and then... 2. SEOmoz bot is concerned simply from a UI stand point, which then put me back to my first question: do you, as humans, consider those two pages as duplicate? Do you see there really the same content? Please, be careful: I am asking that from a "human" stand point (hence from a UI stand point), not from a SE stand point. I am sure that if I ask granny to tell me if those two pages look the same, she's gonna think I wanna make fun of her.Thoughts?

Thank you for your advice, but I am not really a SEO newbie. I begun working on SEO back in 1996 and I have been mentored by Bruce Clay a big deal. I am aware of my website situation and I joined recently these forums trying to improve my SEO knowledge furthermore and to stay up-to-date.

From a human point of view they are different. But humans don't manage bots, just bot rules. Bot rules will follow logic and thus the answer I wrote out below is accurate.

IMHO your canonical tags are wrong. That's the problem. You have told bots that both pages are "the same" (canonical) to /score/PatrickCollectionFlPf.html They aren't - they have separate content. By putting in the wrong canonical tags, you've confused search engines. Bots follow the rules as stated. Your rule says they are the same, so search bots treat them the same.

If SEOmoz bot tells me that those two pages are "duplicate" pages, and with the fact both pages belong to the same item, I don't see what's wrong using a canonical tag pointing to the "main" page of the same item.

"If SEOmoz bot tells me that those two pages are "duplicate" pages, and with the fact both pages belong to the same item, I don't see what's wrong using a canonical tag pointing to the "main" page of the same item."

Your original question was "I don't personally see how these pages can be considered duplicate since their content is quite different."

You need to make a choice. Either you think they ARE duplicate and you want to use canonicals the way you have, or you do NOT think they are duplicate and your canonicals are wrong. You can't have it both ways.

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The rel="canonical" attribute should be used only to specify the preferred version of many pages with identical content (although minor differences, such as sort order, are okay).

I see your point, but you are still looking and my posted issue here the other way around. My question again then is: the fact SEOmoz bot tells me that those two pages are "identical" can't be because of my canonical definition. Therefore must be due to:

1. SEOmoz bot sees those pages identical from a SE stand point (and then I shouldn't worry about my canonical definition because the canonical tag should "fix" that problem). But in this case SEOmoz bot should not mark those page as duplicate because of my canonical tag definition.

2 SEOmoz bot sees those pages identical from a UI stand point, which I don't agree on (as a human I see those pages NOT identical). If canonical tags were made for humans, I wouldn't use them if this was the problem (UI duplicate issue). But since canonical tags are made for robots, I shouldn't worry about my canonical definitions if this is the case, specifically if SEOmoz bot marked those pages as duplicate from a UI stand point.

I'm not sure on these things but if it's a parameter issue i.e. the url only being different after the ?, could a quick solution be to use htaccess and take the tab parameter and insert it into the url? Not sure how scale-able that would be though...

I don't know how the mozbot analyzes that aspect of pages, so this may or may not be a factor in it declaring the two pages as duplicate. But the fact that all your metadata is nearly identical for the two pages can't be helping.

Now I'll break this down simply. First link is A, second link is B, canonical link is C.

A=C

B=C

Therefore A=B.

You've told bots that the mp3 tab is the same content (canonical) as the .html page. You have told bots that the pdf tab is the same content (canonical) as the .html page. Therefore if they are both duplicates of /score/PatrickCollectionFlPf.html, they are duplicates of each other.

You are correct a canonical will take care of it, and using a canonical does not tell the search engine they are identical. It works just like a 301 except for the fact that it does not physically move the users to the canonical page.

But does the search engine take the content from all urls and give the canonical value for al the content, I an not sure it dose, I have never tested it, so I would rather do something with JavaScript or maybe use previous and next tags.

I see your point and I agree that maybe a Javascript solution could better help, but the use of rel=prev/next, in my opinion, wouldn't be appropriate. That's more pertinent for multiple page lists/indexes.

I am sorry, I have realized now that your are suggesting me that the SEOmoz bot has marked those two pages as duplicate "because of my canonical definition"? Is that what you meant? If so, that puzzles me even more because I don't think a canonical definition shared by two or more pages can "create" two or more duplicate pages by itself! Doesn't make sense, according to my knowledge a canonical tag helps avoiding duplicate issues, not the opposite way around.

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